He also wrote on Facebook: "Um. I don't know if it's a 'man's world', but I'm certain women run it. Susan and I are therefore delighted to announce we are expecting a baby. Girl. November. Rdj (sic)"

A spokesperson for the 49-year-old actor and his film producer wife, 40, also confirmed they are expecting another baby.

The happy news comes just days after Robert, who famously battled substance abuse in the past, reportedly accompanied his 20-year-old son, Indio Downey, from his first marriage to Deborah Falconer, to the well-known rehab facility Cliffside in Malibu, California, following his arrest for cocaine possession on June 29.

The actor also released a statement, saying: "There is a lot of family support and understanding, and we're all determined to rally behind him and help him become the man he's capable of being."